I haven't seen this but I've Googled some reports of this when installing your own system git and using the 'credential-osxkeychain' extension to get the command-line git to use OSX's keychain to log in over HTTPS links. You don't need that extension to work with SourceTree, it provides its own integration with the keychain, so if you've done this it would be worth disabling it to see if that helps.

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